/*      $OpenBSD: if_em_soc.c,v 1.6 2025/06/12 06:43:22 jsg Exp $       */

/*
 * Copyright (c) 2009 Dariusz Swiderski <sfires@sfires.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <dev/pci/if_em.h>
#include <dev/pci/if_em_hw.h>
#include <dev/pci/if_em_soc.h>
#include <dev/pci/gcu_var.h>
#include <dev/pci/gcu_reg.h>

#include "gcu.h"

void em_media_status(struct ifnet *, struct ifmediareq *);
int em_media_change(struct ifnet *);

void *
em_lookup_gcu(struct device *self)
{
#if NGCU > 0
        extern struct cfdriver gcu_cd;

        return (device_lookup(&gcu_cd, 0));
#else
        return (NULL);
#endif
}

int
em_attach_miibus(struct device *self)
{
        return 0;
}

int
gcu_miibus_readreg(struct em_hw *hw, int phy, int reg)
{
        struct em_softc *sc = (struct em_softc *)
            ((struct em_osdep *)hw->back)->dev;
        struct gcu_softc *gcu = hw->gcu;
        uint32_t data = 0;
        uint32_t done = 0;
        int i = 0;

        if (gcu == 0)
                return 0;

        /* format the data to be written to MDIO_COMMAND_REG */
        data |= (reg << MDIO_COMMAND_PHY_REG_OFFSET);
        data |= (phy << MDIO_COMMAND_PHY_ADDR_OFFSET);
        data |= MDIO_COMMAND_GO_MASK;

        mtx_enter(&gcu->mdio_mtx);
        bus_space_write_4(gcu->tag, gcu->handle, MDIO_COMMAND_REG, data);

        while (!done && (i++ < GCU_MAX_ATTEMPTS)) {
                DELAY(GCU_CMD_DELAY);
                data = bus_space_read_4(gcu->tag, gcu->handle, 
                    MDIO_COMMAND_REG);
                done = !((data & MDIO_COMMAND_GO_MASK) >> 
                    MDIO_COMMAND_GO_OFFSET);
        }
        mtx_leave(&gcu->mdio_mtx);

        if (i >= GCU_MAX_ATTEMPTS) {
                printf("%s: phy read timeout: phy %d, reg %d\n",
                    DEVNAME(sc), phy, reg);
                return (0);
        }

        mtx_enter(&gcu->mdio_mtx);
        data = bus_space_read_4(gcu->tag, gcu->handle, MDIO_STATUS_REG);
        mtx_leave(&gcu->mdio_mtx);

        if((data & MDIO_STATUS_STATUS_MASK) != 0) {
                printf("%s: unable to read phy %d reg %d\n",
                    DEVNAME(sc), phy, reg);
                return (0);
        }
        return (uint16_t) (data & MDIO_STATUS_READ_DATA_MASK);
}

void
gcu_miibus_writereg(struct em_hw *hw, int phy, int reg, int val)
{
        struct em_softc *sc = (struct em_softc *)
            ((struct em_osdep *)hw->back)->dev;
        struct gcu_softc *gcu = hw->gcu;
        uint32_t data, done = 0;
        int i = 0;

        if (gcu == 0)
                return;

        /* format the data to be written to the MDIO_COMMAND_REG */
        data = val;
        data |= (reg << MDIO_COMMAND_PHY_REG_OFFSET);
        data |= (phy << MDIO_COMMAND_PHY_ADDR_OFFSET);
        data |= MDIO_COMMAND_OPER_MASK | MDIO_COMMAND_GO_MASK;

        mtx_enter(&gcu->mdio_mtx);
        bus_space_write_4(gcu->tag, gcu->handle, MDIO_COMMAND_REG, data);

        while (!done && (i++ < GCU_MAX_ATTEMPTS)) {
                DELAY(GCU_CMD_DELAY);
                data = bus_space_read_4(gcu->tag, gcu->handle, 
                    MDIO_COMMAND_REG);
                done = !((data & MDIO_COMMAND_GO_MASK) >> 
                    MDIO_COMMAND_GO_OFFSET);
        }
        mtx_leave(&gcu->mdio_mtx);

        if (i >= GCU_MAX_ATTEMPTS) {
                printf("%s: phy read timeout: phy %d, reg %d\n",
                    DEVNAME(sc), phy, reg);
                return;
        }
}